<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">
    <title>My JSP 'imgUpload.jsp' starting page</title>
    
	<meta http-equiv="pragma" content="no-cache">
	<meta http-equiv="cache-control" content="no-cache">
	<meta http-equiv="expires" content="0">    
	<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
	<meta http-equiv="description" content="This is my page">
	<!--
	<link rel="stylesheet" type="text/css" href="styles.css">
	-->
	
<script type="text/javascript" src="js/jquery-1.8.3.js"></script>
<style type="text/css">
#preview1{width:150px;height:190px;border:1px solid #000;overflow:hidden; text-align: center;}
#preview2{width:150px;height:190px;border:1px solid #000;overflow:hidden; text-align:center;}
#preview3{width:150px;height:190px;border:1px solid #000;overflow:hidden; text-align:center;}
#imghead {filter:progid:DXImageTransform.Microsoft.AlphaImageLoader(sizingMethod=image);}
</style>
<script type="text/javascript">
       	//图片上传预览    IE是用了滤镜。
        function previewImage1(file){
          var MAXWIDTH  = 260; 
          var MAXHEIGHT = 180;
          var div = document.getElementById('preview1');
          if (file.files && file.files[0]){
              div.innerHTML ='<img id=imghead1>';
              var img = document.getElementById('imghead1');
              img.onload = function(){
                var rect = clacImgZoomParam(MAXWIDTH, MAXHEIGHT, img.offsetWidth, img.offsetHeight);
                img.width  =  rect.width;
                img.height =  rect.height;
//              img.style.marginLeft = rect.left+'px';
                img.style.marginTop = rect.top+'px';
              }
              var reader = new FileReader();
              reader.onload = function(evt){img.src = evt.target.result;}
              reader.readAsDataURL(file.files[0]);
          }else{//兼容IE
            var sFilter='filter:progid:DXImageTransform.Microsoft.AlphaImageLoader(sizingMethod=scale,src="';
            file.select();
            var src = document.selection.createRange().text;
            div.innerHTML = '<img id=imghead>';
            var img = document.getElementById('imghead');
            img.filters.item('DXImageTransform.Microsoft.AlphaImageLoader').src = src;
            var rect = clacImgZoomParam(MAXWIDTH, MAXHEIGHT, img.offsetWidth, img.offsetHeight);
            status =('rect:'+rect.top+','+rect.left+','+rect.width+','+rect.height);
            div.innerHTML = "<div id=divhead style='width:"+rect.width+"px;height:"+rect.height+"px;margin-top:"+rect.top+"px;"+sFilter+src+"\"'></div>";
          }
        }
     
            function previewImage2(file){
          var MAXWIDTH  = 260; 
          var MAXHEIGHT = 180;
          var div = document.getElementById('preview2');
          if (file.files && file.files[0]){
              div.innerHTML ='<img id=imghead2>';
              var img = document.getElementById('imghead2');
              img.onload = function(){
                var rect = clacImgZoomParam(MAXWIDTH, MAXHEIGHT, img.offsetWidth, img.offsetHeight);
                img.width  =  rect.width;
                img.height =  rect.height;
//              img.style.marginLeft = rect.left+'px';
                img.style.marginTop = rect.top+'px';
              }
              var reader = new FileReader();
              reader.onload = function(evt){img.src = evt.target.result;}
              reader.readAsDataURL(file.files[0]);
          }else{//兼容IE
            var sFilter='filter:progid:DXImageTransform.Microsoft.AlphaImageLoader(sizingMethod=scale,src="';
            file.select();
            var src = document.selection.createRange().text;
            div.innerHTML = '<img id=imghead>';
            var img = document.getElementById('imghead');
            img.filters.item('DXImageTransform.Microsoft.AlphaImageLoader').src = src;
            var rect = clacImgZoomParam(MAXWIDTH, MAXHEIGHT, img.offsetWidth, img.offsetHeight);
            status =('rect:'+rect.top+','+rect.left+','+rect.width+','+rect.height);
            div.innerHTML = "<div id=divhead style='width:"+rect.width+"px;height:"+rect.height+"px;margin-top:"+rect.top+"px;"+sFilter+src+"\"'></div>";
          }
        }
        
        function previewImage3(file){
          var MAXWIDTH  = 260; 
          var MAXHEIGHT = 180;
          var div = document.getElementById('preview3');
          if (file.files && file.files[0]){
              div.innerHTML ='<img id=imghead3>';
              var img = document.getElementById('imghead3');
              img.onload = function(){
                var rect = clacImgZoomParam(MAXWIDTH, MAXHEIGHT, img.offsetWidth, img.offsetHeight);
                img.width  =  rect.width;
                img.height =  rect.height;
//              img.style.marginLeft = rect.left+'px';
                img.style.marginTop = rect.top+'px';
              }
              var reader = new FileReader();
              reader.onload = function(evt){img.src = evt.target.result;}
              reader.readAsDataURL(file.files[0]);
          }else{//兼容IE
            var sFilter='filter:progid:DXImageTransform.Microsoft.AlphaImageLoader(sizingMethod=scale,src="';
            file.select();
            var src = document.selection.createRange().text;
            div.innerHTML = '<img id=imghead>';
            var img = document.getElementById('imghead');
            img.filters.item('DXImageTransform.Microsoft.AlphaImageLoader').src = src;
            var rect = clacImgZoomParam(MAXWIDTH, MAXHEIGHT, img.offsetWidth, img.offsetHeight);
            status =('rect:'+rect.top+','+rect.left+','+rect.width+','+rect.height);
            div.innerHTML = "<div id=divhead style='width:"+rect.width+"px;height:"+rect.height+"px;margin-top:"+rect.top+"px;"+sFilter+src+"\"'></div>";
          }
        }
        
        function clacImgZoomParam( maxWidth, maxHeight, width, height ){
            var param = {top:0, left:0, width:width, height:height};
            if( width>maxWidth || height>maxHeight ){
                rateWidth = width / maxWidth;
                rateHeight = height / maxHeight;
                if( rateWidth > rateHeight ){
                    param.width =  maxWidth;
                    param.height = Math.round(height / rateWidth);
                }else{
                    param.width = Math.round(width / rateHeight);
                    param.height = maxHeight;
                }
            }
            param.left = Math.round((maxWidth - param.width) / 2);
            param.top = Math.round((maxHeight - param.height) / 2);
            return param;
        }
</script> 


  </head>
  
  <body>




<table border="1" align="center">

	<tr>
		<td>
			<div id="preview1">
    		<img id="imghead1" border=0 src='<%=request.getContextPath()%>/images/defaul.jpg'>
			</div>

		</td>
		
		<td>
		<div id="preview2">
    		<img id="imghead2"  border=0 src='<%=request.getContextPath()%>/images/defaul.jpg'>
			</div>
	
		</td>
		<td>
		<div id="preview3">
    		<img id="imghead3" border=0 src='<%=request.getContextPath()%>/images/defaul.jpg'>
			</div>
			
		</td>
	</tr>
	<tr>
		<td><input type="file" onchange="previewImage1(this)" style="width: 180px;"/></td>
		<td><input type="file" onchange="previewImage2(this)" style="width: 180px;"/></td>
		<td><input type="file" onchange="previewImage3(this)" style="width: 180px;"/></td>
	</tr>
</table>  
</body>
</html>
